[Mesa-dev] [PATCH 0/6] nir: A couple of SPIR-V focused loop optimizations

[Jason Ekstrand]

While working with Tim on loop unrolling, I realized that the new NIR loop
unrolling pass couldn't actually unroll any loops coming out of SPIR-V
thanks to the way we handle continues.  This little series adds two
relatively small optimization passes that deal with this by peeling apart
ifs at the tops of loops that take one branch on the first iteration and
the other branch on all subsequent operations.

Jason Ekstrand (6):
  nir: Add a couple quick-and-dirty out-of-SSA helpers
  nir: Correctly handle blocks in cf_node_cf_tree_next
  nir: Expose function_impl versions of copy-prop and dce
  nir: Add an optimization pass to remove trivial continues
  nir: Add a pass for moving SPIR-V continue blocks to the ends of loops
  i965: Use nir_opt_trivial_continues and nir_opt_if

 src/compiler/Makefile.sources                |   2 +
 src/compiler/nir/nir.c                       |   2 +-
 src/compiler/nir/nir.h                       |   9 +
 src/compiler/nir/nir_from_ssa.c              | 189 ++++++++++++++++++--
 src/compiler/nir/nir_opt_copy_propagate.c    |   2 +-
 src/compiler/nir/nir_opt_dce.c               |   2 +-
 src/compiler/nir/nir_opt_if.c                | 253 +++++++++++++++++++++++++++
 src/compiler/nir/nir_opt_trivial_continues.c | 141 +++++++++++++++
 src/mesa/drivers/dri/i965/brw_nir.c          |   2 +
 9 files changed, 587 insertions(+), 15 deletions(-)
 create mode 100644 src/compiler/nir/nir_opt_if.c
 create mode 100644 src/compiler/nir/nir_opt_trivial_continues.c

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2.5.0.400.gff86faf